smil: synchronized multimedia integration...

SMIL 1.0 — Synchronized Multimedia Integration Language of 73

SMIL:Synchronized Multimedia Integration Language

Lynda Hardman

Multimedia and Human-Computer Interaction GroupCWI, Amsterdam, The Netherlands

Jacco van Ossenbruggen, Lloyd Rutledge: CWIDick Bulterman, Jack Jansen, Sjoerd Mullender: Oratrix

W3C SYMM working group

Presentation Outline:• Introduction

— Problems with Multimedia on the WWW— Goals for a multimedia format

• Example Presentation• SMIL basics

— media elements, spatial layout, temporal layout, linking, alternate content, semantic annotations• Relationship with other W3C recommendations such as XML• SMIL Support

SMIL 1.0 — Synchronized Multimedia Integration Language Page 2 of 73

The Problem: Multimedia

Lots of Bits• Images, audio and video are beyond Internet design specs

• Results in space/time constraints at:— the server

— the network(s)

— the client

Not All Bits are Equally Important• Time between samples often more important than bits in sample,

for example lip synchronization (but not always...)

Content may be Distributed Across Network• Need to synchronize presentation


Declarative: the key to Web integration

Choices:• Programmed: encode events that display and remove objects

— Lingo (Director) (using Shockwave)

— Java (Dynamic HTML)

• Declarative: specify a set of objects and their synchronization— VRML

— CWI’s CMIF

— INRIA’s Madeus

• Declarative for basic aspects, extra complexity using programmed.


Objectives for Web-based Multimedia

Add synchronization capabilities to the Web

Provide a declarative language for the Web

• interoperability

Format should be text based

• so can be edited by hand• preferably XML based


SMIL

Synchronized Multimedia Integration Language

SMIL is about timing...

combining Web resources...

not just graphics...

in an XML syntax


SMIL

Synchronized Multimedia Integration Language• pronounced smile• SMIL 1.0 became W3C recommendation on 15th June 1998

• SMIL Boston is public draft for next version, last released February 25 2000

SYMM group includes• CWI, Oratrix - GRiNS authoring environment and player• RealNetworks

- RealPlayer 7 (G2), time-focussed media type, 3rd party creation tools• Microsoft - Internet Explorer 5.5 supports HTML+SMIL

Focus• SMIL 1.0 - Multimedia “basics”, adaptive• SMIL Boston -“prettier” (animation, transitions),

integration with other W3C languages


SMIL as XML Markup

Integration language• Media elements referred to, not included

SMIL is XML• Defined with XML DTD• Can be hand-authored• Declarative language

- attribute/value pairs• Integrable with XML environments

Relationship with Other W3C Recommendations• Again, SMIL is XML• Basic layout isomorphic and replacable with CSS• Shares constructs with (X)HTML• SMIL Boston “Family” languages enable new SMIL-based XML formats


XML (eXtensible Markup Language)

xxxxx

xxxx=xxxxxxxx=

xxxxx

xxxxx

xxxx=xxxxxxxx=xxxx

xxxx=xxxxxxxx=

file

Foundation Syntax for all Documents

text content

smil

head

layout

region

body

par seq ref

Document Type Definitions (DTDs)

mediafile

regionsrc

dur=##s


An XML (SMIL) Document

<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE smil PUBLIC "-//W3C//DTD SMIL 1.0//EN" "http://www.w3.org/AudioVideo/Group/SMIL10.dtd"><smil> <head> <meta name="sync" content="soft"/> <layout> <root-layout id="SMIL-" width="492" height="810"/> <region id="address-region" width="50%" height="8%"/> <region id="image-region" top="8%" height="91%"/> </layout> </head> <body> <seq> <par> <text type="text/plain" region="address-region" src="Herengracht284.txt" dur="2s"/> <img region="image-region" src="http://www.amsterdam.nl/bmz/adam/pics/huizen/h284/h284.jpg"/> </par> <par> <text type="text/plain" region="address-region" src="Herengracht539.txt"/> <img region="image-region"

src="http://www.amsterdam.nl/bmz/adam/pics/h539.jpg" dur="2s"/> </par> </seq> </body></smil>


A Sample Presentation

The Network News

On demand on your screen

Formatted text,video and audio


Local anchor setup

Top Story:

Growth of the World-Wide Web

Amsterdam

Graph appears during spoken commentary


Remote Correspondent

Top Story:


Amsterdam

Los Angeles

First video finishes, second video plays


Following a Link

Top Story:


Amsterdam

Los AngelesAt any point during the videothe viewer can request extrainformation.


So what do we need to specify?

(part of) media item

Top Story:


Amsterdam

Los AngelesI Content

II Spatial layout III Temporal layout

anchor

remote

anchor

remote

anchor

growth

A

remoteA

storyA

IV Links

source and destination

V Alternative contentbandwidthtaskuser characteristics

VI Semanticannotations


I Content

audio

audio

The top story tonight looks at the development of the World Wide Web. The growth of the Web has been exponential for the last few years and it is still unclear....


Spatial and Temporal Dimensions of Media Items

y

x

t

y

x

t

y

x

t

text:2D objects in linear sequence, aspect ratio not important

graphics:2D layout, aspect ratio probably important

y

x

t

?

video:2D layout plus time, aspect ratio probably important

audio:time only

?:0 or 2D layout, with or without time


Instance of Media Item

I Media item, or part

II Extent, position andZ-order

III Duration

IV Alternate Content

V Link end-points

VI Associated semantics

We will return to all these points at the end.


SMIL — Media Object Elements

SMIL 4.2.3. ref, text, textstream, img, audio, video and animation<ref src=”anything.???” ... />

<text src=”caption.html” ... />

<textstream src="stockticker.rtx" ... />

<img src=”graph.jpg” ... />

<audio src="http://www.w3c.org/SYMM/joe-audio.wav" ... />

<video src="rtsp://www.cwi.nl/SMIL/video.rm" ... />

<animation src=”cute.anim” ... />

The src attribute is a URI, locating the data.

The player does not derive the exact type of the media object from the name of the media object element. It uses, e.g., the "type" attribute, or the type information communicated by the server or the operating system.Names are for readability.

imagesvideo textaudio


Specification of part of media item

y

x

t

y

x

t

y

x

t

y

x

t

text — string image — area

video — (moving) area audio — phrase


SMIL — clips in time

Time and space treated independently.• Spatial clipping done via region mechanism, discussed later

• Time restricted to a single extent— a contiguous section of a continuous media object can be specified

SMIL 4.2.3. clip-begin and clip-end attributes<video src="the.news/mpeg/zoomin.mpv"

clip-begin="smpte=00:01:19:20" clip-end="smpte=00:01:38:40" ... />

— syntax of values is ...

t2t1duration


SMIL — clip begin/end syntax

Clip-time-value ::= Metric "=" ( Clock-val | Smpte-val )

Metric ::= Smpte-type | "npt"

Smpte-type ::= "smpte" | "smpte-30-drop" | "smpte-25"

Smpte-val ::= Hours ":" Minutes ":" Seconds

[":" Frames [ "." Subframes ]]

Hours ::= 2DIGIT

Minutes ::= 2DIGIT

Seconds ::= 2DIGIT

Frames ::= 2DIGIT

Subframes ::= 2DIGIT

Metric has three SMPTE options: smpte, smpte-30-drop, smpte-25,otherwise it is NPT (Normal Play Time), which uses a clock value.

Examples of clip-begin value:SMPTE timestamp: smpte=10:12:33:20NPT: npt=12:05:35.3

— syntax of a clock value is ...


SMIL 4.2.1. — Clock value syntax

Clock-val ::= Full-clock-val | Partial-clock-val | Timecount-val

Full-clock-val ::= Hours ":" Minutes ":" Seconds ("." Fraction)?

Partial-clock-val ::= Minutes ":" Seconds ("." Fraction)?

Timecount-val ::= Timecount ("." Fraction)?("h" | "min" | "s" | "ms")? ; default is "s"

Hours ::= 2DIGIT; any positive number

Minutes ::= 2DIGIT; range from 00 to 59

Seconds ::= 2DIGIT; range from 00 to 59

Fraction ::= DIGIT+

Timecount ::= DIGIT+

2DIGIT ::= DIGIT DIGIT

DIGIT ::= [0-9]

Examples of legal clock values:

Full clock value: 02:30:03 = 2 hours, 30 minutes and 3 seconds Partial clock value: 02:33 = 2 minutes and 33 seconds Timecount values: 3h , 45min , 30s, 5ms


II Spatial layout

Top Story:


Amsterdam


Possible ways to specify layout

t

x

y

t

x

y

t

x

y

t

x

y w.r.t. x,y axes w.r.t. item

function of time regions


SMIL — Region

Each media object instance contains a region reference:• allows author to know where object will be played

<video src=”anchor.mpg” region=”V-main” />

SMIL 3.3.1. region is defined by:

<region id="V-main" top="5%" left="50%" height="100%" width="100%" z-index=”3” />

<region id="V-remote" top="10" left="100" height="200" width="200" z-index=”3” />

• An “id” for each region is required. Its value is an XML identifier.• Length values are percentage values or in pixels. The unit “px” may be omitted.

and ZHW

x,y


Z-index

The Z-index gives the stacking order (highest integer stacks on top).If elements A and B have the same value Z-index then:

• if B starts after A then B is stacked on top of A.

• if B and A start simultaneously and B is lexically after A

then B is stacked on top of A.


Why Have Height and Width?

Amsterdam

Los Angeles

Top Story:

Growth of the

World-Wide Web

. . . blah blah blah blah

blah blah blah blah! Blah blah blah blah blah blah blah blah blah bla blah blah blah blah bla blah blah blah blah bla

blah blah blah blah bla blah blah blah blah bla blah blah blah blah...


Constraining Layout

Amsterdam

Los Angeles

Top Story:

Growth of the

World-Wide Web

. . . blah blah blah blah

blah blah blah blah! B


The WebNews Layout

<layout>

<root-layout width="721" height="587" id="matise" />

<region id="T_title" left="2%" top="5%" width="40%"height="24%" z-index=2 />

<region id="V-remote" left="3%" top="44%" width="54%"height="40%" z-index=3 />

...

</layout>

Top Story: Growth of the

World-Wide Web

Amsterdam

Los Angeles

V-main

T-anchor

r_title

V-remote

root-layout

T-title


SMIL — Basic Layout

SMIL 3.3.2. root-layout defines a rectangular area. All other regions are defined with respect to it — there is no nested, or relative, layout.

The root-layout is the viewport, or window, to which the presentation is rendered visually.

A SMIL document can have at most one root-layout.

If a media object element has no explicit region attribute then a default layout is given by the player.

To obtain the default layout for all media object elements, an empty SMIL basic layout can be declared:

<layout type="text/smil-basic-layout"></layout>

If no root-layout is specified then the size of the window is calculated by the player to be as large as the largest media object element.


SMIL— clips in space

SMIL 3.3.1 fit attribute

fill

hidden (default) hidden (default)

meet

scroll

slice

aspect rationot preserved

media item

aspect ratio

not scaledmedia itemnot scaled

preserved

media itemnot scaled

aspect ratiopreserved


Relationship between SMIL layout and CSS2

SMIL basic layout is consistent with the visual rendering module in CSS2. It introduces the “fit” attribute. It is otherwise a subset.

SMIL basic layout applies only to media object elements.

SMIL media object elements refer to a region. CSS2 “region” elements refer to the media object elements.


III Temporal Layout

anchor

remote

anchor

remote

anchor

growth

A

remoteA

storyA


Which time?

Types of time:• media item time axis

— video divided in frames, audio sampled at 44kHz

• document time— image starts at certain time and ends at a later time

• run-time presentation— video data bits get caught up in network, so end time is delayed

duration

start time end time

start time end time


Duration of a media object element

Intrinsic• derived from content of media item

• intrinsic duration of discrete media, such as text or image, is zero.

Explicit• an explicit duration can be given

SMIL 4.2.1. dur attribute, value is a clock-value or “indefinite”<video src="zoomin.mpv" region=”V-main” dur=”4s” />

<video src="zoomin.mpv" region=”V-main” dur=”6.5s” />

— in this case, the audio track just stops and the last frame of the video remains

audio (or video) lasts 5.3 seconds

media object stops after 4 seconds

media object stops after 6.5 seconds


Duration of a Media Object Element ctd.

An object can have its duration extended by repeating the content.

SMIL 4.2.1. repeat attribute<video src="zoomin.mpv" region=”V-main” repeat=”3” />

<video src="zoomin.mpv" region=”V-main” repeat=”3” dur=”11s” />

<video src="zoomin.mpv" region=”V-main” repeat=”indefinite” />

Attribute value of repeat is an integer or “indefinite”.

media object stops after 15.9 seconds

media object stopsafter 11 seconds

media object stopswhen parent stops


Start time of elements—par

SMIL 4.2.1 par element groups elements which are played in parallel • Children of a par element are started at the same time

<par>

<text src="leader_title.html" region="m_title" dur=”5s” />

<video src="cnn.mpv” region="V-Main" />

<audio src="cnn.aiff" region="music" />

</par>

• The start time of a child of a par element is equal to the start time of the par element itself.

anchor

anchor

storyA


Start time of elements—seq

SMIL 4.2.2 seq element groups elements which are played sequentially• Children are played one after the other, based on the textual order

<seq>

<video src="logo.mpv” region="V-main" />

<video src="anchor.mpv” region="V-main" />

</seq>

• The start time of the first child of a seq element is the start time of the seq element itself.

• The start time of the next child is the end time of the previous child.

anchor

anchor

storyA


Par’s and seq’s can be nested

<seq><par>

<text src="leader_title.html" region="m_title" dur=”5s”/><video src="cnn.mpv” region="V-Main" /><audio src="cnn.aiff" region="music" />

</par><par>

<text src="story_title.html" region="m_title" dur=”2s” /><video src="anchor.mpv” region="V-Main" /><audio src="anchor.aiff" region="music" />

</par><seq>

anchor

anchor

storyA


Explicit start time in a par element

SMIL 4.2.1. begin attribute, delay-value<par>


<video src="cnn.mpv” region="V-Main" begin=”1.4s” />

<audio src="cnn.aiff" region="music" />

</par>

• Video is delayed until 1.4s after the start of the par element.

• The syntax of the delay-value is a clock-value (page 18).

anchor

anchor

storyA


Explicit start time in a seq element

SMIL 4.2.1. begin attribute, delay-value<seq>


<video src="anchor.mpv” region="V-main" begin=”1.4s”/>

</seq>

• Video is delayed until 1.4s after the end of the previous element.

anchor

anchor

storyA


Start time relative to another element

SMIL 4.2.1. begin attribute, event-value<par>


<video id=”v1” src="cnn.mpv” region="V-Main" begin=”1.4s” />

<audio src="cnn.aiff" region="music" begin=”id(v1)(0.5s)” />

</par>

• Audio is delayed until 0.5s after the start of video element “v1”.

• Syntax of event-value is “id(Id-value)(begin|end|clock-value)”.

anchor

anchor

storyA


End time of media object element

SMIL 4.2.4.2. A media object element with an implicit or explicit duration and a start time has an end = begin + duration.

<video src="cnn.mpv” region="V-Main" begin=”4s” />

SMIL 4.2.1. end attribute. Syntax same as begin attribute.SMIL 4.2.4.2. A media object element with an explicit start time and an explicit end has a duration = end - begin.

<text src="title.html" region="m_title" begin=”4s” end=”8s” />

anchor

begin end

duration

storyA

begin end

duration


End time of media object element ctd.

A media object element with an explicit start time, a duration and an explicit end, has as end time the minimum of the end time and (begin+duration).

<seq>

<text src="title.html" region="m_title" begin=”4s” dur=”4s” end=”10s” />

<text src="title.html" region="m_title" begin=”14s” dur=”6s” end=”18s” />

</seq>

storyA

begin end begin end

dur dur

end time=8s end time=18s



A media object element may also have an intrinsic duration.<video src="cnn.mpv” region="V-Main" begin=”3s” dur=”14s”

end=”12s” />

anchor

begin (3s) end (12s)

implicit durationdur

end time=12s

(17s)



If the end time is before the begin time then the element is not played.

The end time of a media object element with indefinite duration is determined by the end time of its parent.

If the parent has no definite end time then the media object element will play indefinitely.


End time of seq element

A seq element ends when its last child ends or according to its end attribute.

If its last child has an indefinite end then the seq has an indefinite end.<seq>


<video src="anchor.mpv” region="V-main" />

<text src="title.html" region="m_title" dur=”indefinite” />

</seq>

anchor

anchor

storyA


End time of par element—first

SMIL 4.2.1 endsync• par can end when the first element to finish ends

<par endsync=”first”>




</par>

anchor

anchor

storyA

end time


End time of par element—id-ref

• par can end when the referenced element ends: id(Id-value)<par endsync=”id(v1)”>

<text src="leader_title.html" region="m_title" />



</par>

anchor

anchor

storyA

end time


End time of par element—last

• par can end when the last element to finish ends (default)<par endsync=”last”>




</par>

anchor

anchor

storyA

end time


Types of synchronization

Hard synchronization• Video delayed by network, audio stops and waits

— useful for separate lip-synchronized audio and video streams.

Soft synchronization• Video delayed, audio continues — useful for background music.

• Note: this behaviour is not specified in the standard.

anchor

anchor

anchor

anchor


IV Alternate content

... explosive growth of the WWW ...

text

audio

... explosieve groei van het WWW ...

... eksplozivni rast WWW ...

... explosive growth of the WWW ...

... crescita esplosiva della WWW ...


Adaptation issues

Adaptation for User• Task/environment/disabilities• Language• Previous knowledge

Adaptation for Environment• Delays: bandwidth, available CPU time• Available processing: media peripherals, additional browser features

W3C Web Accessibility Initiative (WAI)• Guidelines for accessible (text-based) Web documents• Meaningful values for attributes like alt, title, abstract and longdesc• Meaningful content of link triggers (a element)• How to apply these to a fixed timeline?


Switch

SMIL 4.3. switch

• At most one of the children of a switch element is played.

• The first acceptable element is chosen, so ordering should be best first.<switch>

<audio system-bitrate=”44000” src=”hi-res.aiff” />

<audio system-bitrate=”16000” src=”low-res.aiff” />

</switch>

• If no element is suitable then no child of the switch is played.A catch-all choice at the end of the switch (with no test attribute) could be used.


Test Attributes

Selecting Content Alternatives• system-bitrate — bandwidth of Web connection

- can switch media: video -> image -> text• type — mime type of media object• system-required — select if certain processing available

Selecting for User• system-language — what language the user understands best• system-captions — show content if user want closed captioning (subtitles)

- usually single content of switch (on or off)

• system-overdub-or-caption — choice between audio or text

Adaptive Visual Complexity• system-screen-size, system-screen-depth

Extension Attributes for Particular Domain• Won’t be recognized by all browsers

Potential examples — knowledge level, audience profile, length of time


Multiple test attributes

Switch on bitrate and language<switch>

<audio system-bitrate=”44000” system-language=”nl” src=nl-hi-res.aiff />

<audio system-bitrate=”44000” system-language=”en”src=uk-hi-res.aiff />

<audio system-bitrate=”16000” system-language=”nl”src=nl-low-res.aiff />

<audio system-bitrate=”16000” system-language=”en”src=uk-low-res.aiff />

</switch>

SMIL 4.2.1. par, seq and media object elements can also have test attributes<textstream system-captions=”on” src=”txstream.rtx” />

• Element is played, or not, independently of any other element.


V Linking

Top Story:


Amsterdam

Los Angeles


Link from element to presentation

SMIL 4.5.1. <a> element — similar to HTML <a> element.• Source is unaffected and destination, href, is shown in new window.

<a show="new" href="archives-dcab.smi">

<video src="zoomin.mpv" region="V-Main" />

</a>

• Source may also pause while destination is shown,

• or destination may replace the source (default).

Top Story:


Amsterdam

Los Angeles


Link from element to element

SMIL 4.5. Linking to SMIL fragments• Destination element within another SMIL document uses # connector.

<a show="new" href="time-time.smil#XVII">

<text src="archives-dcab.html" region="I-Main" dur=”indefinite” />

</a>

• Destination presentation starts as if the presentation had been fast-forwarded to the beginning of the element designated by the fragment.


Link from element to subpart of media object

SMIL 4.5.2. anchor elementThe anchor element allows the specification of temporal and spatial subparts of a media object element.

• Spatial subparts use the coords attribute (similar to HTML image maps).<video src="zoomin.mpv" region="V-Main" >

<anchor id=”mic” coords=”40%, 70%, 55%, 100%” />

</video>

• Order of coords is left-x, top-y, right-x, bottom-y.• Temporal subparts use the begin and end attributes.

<video src="zoomin.mpv" region="V-Main" >

<anchor id=”graph-ref” begin=”4.3s” end=”6.8s” />

</video>

fit=”slice”

Defined w.r.t. media object,not w.r.t. region


Links in embedded documents

SMIL 4.5. Handling of links in embedded documents• SMIL players may involve other (non-SMIL) applications or plug-ins,

for example an HTML renderer.<text src=”comment.html” region=”C-right” />

• An HTML browser may display SMIL documents embedded in an HTML page.

• A SMIL document may contain a media object element of data type SMIL.<ref src=”webnews.smi” region=”S-left” />

. . . blah blah blah blah blah [4] blah

blah blah blah blah! Blah blah blah --blah blah blah. Blah blah blah? Blah!Blah blah blah, blah [5], [6], [7]. (Blah

: anchor in containing SMIL document : anchor in embedded SMIL document

Live from Amsterdam

Dick Bulterman next story

: anchor in embedded HTML fragment


Anchors as source and destination of a link

• href needed if used as source, id needed if used as destinationSource document (image in SMIL, anchor and link defined in SMIL):

<img src="home-sweet.gif" region="I-Main">

<anchor href=”time-time.smil#gable-3” show=”new”coords=”35%, 5%, 40%, 95%” />

</img>

Destination document “time-time.smil” (image in SMIL):

<img src="XVII.tiff" region="house-right" >

<anchor id=”gable-3” coords=”30%, 0%, 70%, 100%” />

</img>


VI Semantic annotations

SMIL 3.4. meta element defines properties of a document

• The name attribute is the property and the content attribute gives the value.<meta name=”title” content=”Web News, 15th June 1998” />

<meta name=”base” content=”http://www.cwi.nl/SMIL/webnews/” />

• The list of properties (values of name attribute) are open-ended.

Attributes on par, seq and media object elementsSMIL 4.2.1. abstract, author, copyright, title (recommended)

Attributes on media object elementsSMIL 4.2.3. alt (contains alternative text, recommended), longdesc (supplement to alt, but longer and should include descriptions of anchors)

Attributes on region elementsSMIL 3.3.1 title (recommended)


High-Level Structure of Document

Partitioning in Sections

<smil>

<head>

<meta>

... information about the document ...

</meta>

<layout>

... layout definition ...

</layout>

</head>

<body>

... objects and temporal relations ...

... links and anchor objects ...

</body>

</smil>


Backwards Compatibility

SMIL 3.3.1. skip-content attribute allows documents in higher SMIL versions to be played by players of lower SMIL versions.

If the skip-content attribute is true (default value) then the content of the element is ignored in the SMIL 1.0 player.


SMIL’s Relationship with Other W3C Recommendations

SMIL Documents are XML Documents• SMIL syntax is defined by an XML DTD

Private Extensions must use Namespaces• Skip-content attribute allows content of non-SMIL elements to be played• System-required attribute states the subtree requires the named

implementation

SMIL Layout and CSS-2• SMIL basic layout is consistent with the visual rendering module in CSS-2

- it introduces the “fit” attribute- it is otherwise a subset.

• SMIL basic layout applies only to media object elements.• SMIL media object elements refer to a region

- CSS-2 “region” elements refer to the media object elements.


SMIL Boston

Much Much More• SMIL 1.0 spec is 30 pages, SMIL Boston spec is 300 pages

Animation• Values of SMIL constructs change over time• Enables more vibrant presentation• Incorporation with SVG

Timing Integration• Use of SMIL constructs in other document sets• Enables, for example, HTML+SMIL in Internet Explorer• Raises issues of semantic significance of hierarchy

Broadcasting/streaming• No preload or full download• Use of non-predictive events in timing• Need to maintain hard synchronization• Large potential use of SMIL


SMIL Boston Modules

SMIL is broken up into separate modules• Thus not all of SMIL Boston needs to be used in one instance

The SMIL Boston Modules are:• Animation• Content Control — selection, adaptation and optimization• Layout • Linking — navigation• Media Object — media content that is integrated into presentation• Metadata — machine-processible data about the presentation• Structure — base elements for high-level SMIL structure• Timing and Synchronization — 98 pages!!• Transition Effects — fades and wipes• Document Object Model (DOM) — XML data transfer and exchange


SMIL Boston Language Profiles

Multiple SMIL Profiles• Made by combining SMIL Boston modules

SMIL Boston Profile• “Maximum” SMIL• Describes how all SMIL Boston modules are combined into one format

HTML+SMIL• In Internet Explorer 5.5 — originally HTML+Time• Encodes “PowerPoint-like” presentations• Textflow-based display that changes with time and interaction

SMIL Basic Profile• “Minimum” SMIL• For low-end devices like mobile phones and palmtops• Ensures a class of SMIL presentations that can be seen on these devices

Baseline Media Formats• Non-normative selected media formats for each media type


Existing Tools

RealPlayer 7 (G2)• Primary driving force

- millions downloaded

• Real-Media specific player made broader with SMIL incorporation• 3rd party template-focussed authoring tools

GRiNS• Commercial spinoff from CMIFed research tool• High-end authoring tool for complex presentations• Authors presentations using RealPlayer 7 formats• GRiNS player

Internet Explorer• HTML+SMIL profile

QuickTime 4.1• Recently announced SMIL support


SMIL Applications

Infotainment Accessibility

Conceptual Art


Summary

SMIL — media object element revisited<video id=”vid1” region=”R_video”

src=”rtsp://www.w3.org/CoolStuff.rm” clip-begin="smpte=00:01:19:20" clip-end="smpte=00:01:38:40"begin=”3s” dur=”22s”end=”21s”alt=”Video of Joe chatting to Tim”longdesc=”Joe and Tim are in a meeting room. Joe is on the

left and Tim is on the right”title=”Joe greets Tim”system-bitrate=”28800”>

<anchor id="joe" begin="0s" end="5s" coords="0%,0%,50%,50%"href="http://www.w3.org/" />

<anchor id="tim" begin="5s" end="10s" coords="50%,50%,50%,50%"href="http://www.w3.org/Tim" />

</video>


More information

• http://www.cwi.nl/SMIL

• http://www.w3.org/TR/REC-SMIL• http://www.w3.org/TR/SMIL-Boston

• http://www.w3.org/AudioVideo/• http://www.w3c.org/Press/1998/SMIL-REC

• http://www.justsmil.com/

• http://www.oratrix.com/• http://www.real.com/player